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DiscoverCircuits.com -- Hobby Corner
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Wednesday, June 02, 2021 03:48 AM
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Wireless LED
Flasher -- January 9, 2011 |
| When you would like to
flash a LED through a thick plastic case without wires, use this hobby circuit. It
performs this feat. It draws about 300ua of average current at 5v. It
can be powered from a supply ranging from 3v to 6v. It uses a low power op Amp as a
pulse generator. A negative going pulse from that generator gates a power
oscillator on for about 20ma. That oscillator is connected to a series
resonant circuit, which drives a small coil. |
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Feedback from the coil
insures that the oscillator runs at the LC network’s resonant frequency. A
similar coil, located some distance away, collects some of the magnetic field
produced by the oscillator’s coil and uses it to drive a LED. A separation of
about 1/2 inch is about the limit for this circuit. |
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Click on Circuit Below to view PDF of Schematic |
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eMail David A.
Johnson, P.E. about this circuit |
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